Process of wet magnetic separation on roller separators



June 23, 1925. 1,543,534

G. ULLRICH PROCESS OF WET IAGNETIQ SEPARATION Olf' ROLLER SEPARATORS Fileq Oct. 18, 1923 roller separators.

arated. When using a deep current on Patented June 23, 1925.

UNITED STATES GEORG U'LLRICH, OF MAGDEBUBG, GERMANY, ASSIGNOR TO THE FIRM FRIED. KRUPP GRUSONWEBK AKTIENGESELLSCIIAFT,

0F MAGDEBURG-BUCKAU, GERMANY.

IROCESS 0F WET MAGNETIC SEPARATION ON ROLLER SEPARATORS.

Application filed October 18, 1923. Serial No. 669,412.

To all whom it may concern:

'Be it known that I, Gnone ULLRIOH, engineer, citizen of the German Empire, residing bur'g, Germany, have invented certain new and useful Improvements in Processes of Wet Magnetic Separation on Roller Separators, of which the following is a specification.

The present invention relates't'o a process of wet magnetic separation as applied to It has been known hitherto to provide a liquid film or wall in whiclr the magnetic material is drawn to the mag-- netic surface. This system has been used in ring separators in which water is supplied to the ring edges from above, thematerial to be separated being passed into the liquid wall thus formed. It has also been attempted to use this method in roller separators but with the modification that the liquid wall is built up from below, that is to say the material is passed beneath the roll in a liquid current which contacts with the lower surface of the roll. Unless a very deep current is used in such a system, however, only a very narrow magnetic field is made possible so that coarse material cannotv be selpt e other hand a considerable portion of magnetic particles are carried away resulting in considerable loss. The object of the present invention is to form theliquid wall in such a manner that these disadvantages will be overcome.

When magnetic material is attracted to the roller surface from a currentpassing beneath .same only a portion of the roll surface is utilized, that is to say the magnetic material attaches to the roll at its I base and is then carried a'short distance u ward thereby before being removed. T e

same of course applies to the drum surface when the magnetic roller is surrounded by a drum. The descending surface of the roll is thus always free of material, and it is the object of the present invention to utilize this surface in forming the liquid wall as will be explained full hereinafter. This is accomplished by fee ing water to the descending lateral surface so that it flows downward, thus forming a liquid film between the base of the roll and the current passing beneath the roll and containing the magnetic materials.

at Nr. 2 Winterfeldstrasse, Magde-' .this invention, viz. Fig. la single roller-separator without "12 is placed. The

of separation When using this process in a tiltable plant which is provided with counter poles situated below-the feed table it is obvious that the liquid wall will stand in a difierent relation to the magnetic field when the plant is tilted than when it is in a horizontal position. In order to keep the liquid wall in correct relation to the magnetic field therefore the present invention contemplates means for adjusting the rolls laterally and relative to their respective counter poles. Such an adjustment may also be useful. in separator plants having a fixed inclination in order to make possible the exact positioning of the liquid wall.

The drawing shows two examples dealing with the execution of the process counter-poles.

pulp flows from hopper 2 in the direction a2 of the arrow. The magnetic material attracted by the roll out of the pulp is car-- ried along by said roll on part'of its runway which is} pointing upward in order to be discarded or sprayed 03 at 4;. On the downward part of its path the roll is free of material. Nozzle 5 'squirts the filmliquid here on to runs down at the-lower part of the path and forms a film between the separating and the current of pulp.

relating to surface Fig. 2 a multiple roller-separator includ- I to Fig. 1 the magnetic rollfi I the feed chute l, on to which the roll, and said liquid According to Fig. 2 three rolls fi, 7 and p 8 are provided which rotate in the fixed drums 9, 10 and 11. Under each roll a pole ul is discharged from hopper 14; onto fee ta le 13 which extends beneath all the rolls. The magnetic material attracted to drum 9 at the first spot wanders upwards on same, in

the direction as of-the arrow, under the influence of the' rotating roll 6. Said materialis discarded by the aid of the deflecting contr'ivance 15 and the s uirt l6 and is then brought forward to rum 10 for further separation. 'The cleaned magnetic material is treated once more at the third? spot of separation in order to be carried ofi, finally over the chute 17. The residues from.) the first spot of separation are carriedpfl I 7 I 2.i-Aj.wet.;magnetic process for separating a at 18 while those from the second spotpf separation are treated again at the third spot of separation and carried as at '19., The above areonly examples. Magnetic "avail is-formed atfthebase of "said roll; del ivering;the"materialjto saidw'alllin a liquid materials and residues can be carried GEL-adj lib. between the particular spots of separa:

tion or can be passed through qtwo' or" through one spot of separation. @Ateach 7 of" the 3 separating spots a film is formed,

in order to feed liquid at the nozzles 20 to that side of the drum where the roller surface moves downwards.

located within the efiective old. In orderto avoid this, one renders the roll adj ustable" laterally, viz, vertically to its axis. One is therefore in a posit-ion to adjust each roll in such'a way, that the film-current meets the desired spot of the pulp-current, as for instance in the most powerful. zone of sep aration.

Figs. 3 and 4 show means for obtaining this roll adjustment. Referring to these figures, 21 represents a pedestal of nonmagnetic material, for "instance brass attached at the side of the pole '12. A foot 23- of the roller bearing is displaceable in a slot 22', in each of the pedestals 21. The foot 23 is provided with a threaded nut 26, which cooperates with the screw spindle 25, this latter being rotatable by means of a hand wheel 24. It is to be understood that this mechanism is providedat each end of the roll and in this manner the latter is adapted to be displaced in a radial sense, in order to properly position the liquidwall when the apparatus is tilted.

Claims:

1. 'A wet magnetic process for separating material consisting in supplying a liquid to the descendin lateral surface of a magnetic roll where y a downwardly flowing liquid wall is formed at the base of said roll, delivering the material to said wall in a liquid current traveling in the direction The liq-" 'uid flows off at the drum and drops If the inclination were altered able pa c'less-of said material in said liquid mg them outfof said wall and wall, 51cc e v.3 en si fing them i material consisting'in supplying a liquid to the descending l'ateralsurfacej offfa magnetic 1 roll whereby a downwardly current traveling in the direction of, rota-,-

tion of said roll,raising the niagnetizable particles .ofsaid material in said liquid w n,- conveying them out of said wall onlsaidj I roll-and removing them therefrom by means .1

of liquid jet.

3. Apparatus for'the wetuma ghetic flowing liquid aration of material,' comprising a' rotating -magnetic roll, means for passing the ma:

terialin a liquid current beneath said roll in the direction .of roll rotation, and means forgsupplyinga liquid to the descending lateraI'su-rface of said roll, whereby a liquid .waugis formed between thebase of said roll andthe'surface of said liquid current..

4.Apparatus for the'wet magnetic sep* aration of material, comprising a rotating magnetic roll, means for' passing the material in a liquid current beneath said roll in the direction of roll rotation, means for supplying a liquid to the descending lateral surface of said roll, whereby a liquid wall is formed between the base of said roll and the surface of-said liquid current, and means for supplying a liquid to the ascending lateral surface of said roll for removing the material attracted by said roll and conveyed therebyout of said liquid wall.-

5. Apparatus for the Wet magnetic sep aration'of material, comprising a rotating magnetic roll, a sluice for guiding the material beneath said roll transversely to the axis thereof, a magnet system beneath said sluice and opposite said roll, means for forming a liquid wall between the base of said roll and said sluice, means for tilting the apparatus as a unit, and meansforlatershone ULLRICH.

Witnesses:

1 E. KmrrnL,

Room: L. Ausmcn. 

